Commit Graph

21 Commits

Author SHA1 Message Date
Paul Sokolovsky
93e353e384 py/gc: Implement GC running by allocation threshold.
Currently, MicroPython runs GC when it could not allocate a block of memory,
which happens when heap is exhausted. However, that policy can't work well
with "inifinity" heaps, e.g. backed by a virtual memory - there will be a
lot of swap thrashing long before VM will be exhausted. Instead, in such
cases "allocation threshold" policy is used: a GC is run after some number of
allocations have been made. Details vary, for example, number or total amount
of allocations can be used, threshold may be self-adjusting based on GC
outcome, etc.

This change implements a simple variant of such policy for MicroPython. Amount
of allocated memory so far is used for threshold, to make it useful to typical
finite-size, and small, heaps as used with MicroPython ports. And such GC policy
is indeed useful for such types of heaps too, as it allows to better control
fragmentation. For example, if a threshold is set to half size of heap, then
for an application which usually makes big number of small allocations, that
will (try to) keep half of heap memory in a nice defragmented state for an
occasional large allocation.

For an application which doesn't exhibit such behavior, there won't be any
visible effects, except for GC running more frequently, which however may
affect performance. To address this, the GC threshold is configurable, and
by default is off so far. It's configured with gc.threshold(amount_in_bytes)
call (can be queries without an argument).
2016-07-21 00:37:30 +03:00
Damien George
02fa8dff85 py/modgc: Remove obsolete extern declaration. 2015-12-17 13:20:40 +00:00
Damien George
cbf7674025 py: Add MP_ROM_* macros and mp_rom_* types and use them. 2015-11-29 14:25:04 +00:00
Paul Sokolovsky
1b586f3a73 py: Rename MP_BOOL() to mp_obj_new_bool() for consistency in naming. 2015-10-11 15:18:15 +03:00
Damien George
e1e359ff59 py: Put mp_sys_path, mp_sys_argv and gc_collected in mp_state_ctx_t.
Without mp_sys_path and mp_sys_argv in the root pointer section of the
state, their memory was being incorrectly collected by GC.
2015-02-07 17:24:10 +00:00
Damien George
b4b10fd350 py: Put all global state together in state structures.
This patch consolidates all global variables in py/ core into one place,
in a global structure.  Root pointers are all located together to make
GC tracing easier and more efficient.
2015-01-07 20:33:00 +00:00
Damien George
51dfcb4bb7 py: Move to guarded includes, everywhere in py/ core.
Addresses issue #1022.
2015-01-01 20:32:09 +00:00
Damien George
3b603f29ec Use MP_DEFINE_CONST_DICT macro to define module dicts.
This is just a clean-up of the code.  Generated code is exactly the
same.
2014-11-29 14:39:27 +00:00
Damien George
109c1de015 py: Make gc.enable/disable just control auto-GC; alloc is still allowed.
gc.enable/disable are now the same as CPython: they just control whether
automatic garbage collection is enabled or not.  If disabled, you can
still allocate heap memory, and initiate a manual collection.
2014-10-31 21:30:46 +00:00
Damien George
30dd23aa7f doc: Document gc, sys, math, cmath. 2014-08-10 17:50:28 +01:00
Damien George
bb4c6f35c6 py: Make MP_OBJ_NEW_SMALL_INT cast arg to mp_int_t itself.
Addresses issue #724.
2014-07-31 10:49:14 +01:00
Damien George
40f3c02682 Rename machine_(u)int_t to mp_(u)int_t.
See discussion in issue #50.
2014-07-03 13:25:24 +01:00
Paul Sokolovsky
5aa740c3e2 modgc: Add mem_free()/mem_alloc() methods.
Return free/allocated memory on GC heap.
2014-06-25 14:28:11 +03:00
Paul Sokolovsky
59c675a64c py: Include mpconfig.h before all other includes.
It defines types used by all other headers.

Fixes #691.
2014-06-21 22:43:22 +03:00
Emmanuel Blot
f6932d6506 Prefix ARRAY_SIZE with micropython prefix MP_ 2014-06-19 18:54:34 +02:00
Paul Sokolovsky
380f147d2e modgc: Real 64-bit cleanness. 2014-06-06 03:01:39 +03:00
Paul Sokolovsky
a3ef8087e8 modgc: 64-bit cleanness. 2014-06-06 02:34:17 +03:00
Paul Sokolovsky
755a55f507 modgc: Implement return value for gc.collect(), enable on Unix. 2014-06-05 22:48:02 +03:00
Damien George
ee3fd46f13 Rename configuration variables controling Python features.
Now of the form MICROPY_PY_*.  See issue #35.
2014-05-24 23:03:12 +01:00
Damien George
8c1c7488b2 Add gc.enable, gc.disable; remove pyb.gc. 2014-05-08 23:04:49 +01:00
Paul Sokolovsky
f9e54e0ea5 modgc: Add new module for GC-related functionality. 2014-05-06 02:28:49 +03:00